I am a maxnc user. Unfortunitly. My control box to suffered an ill fate. While I am open loop. I can tell you that I will never ever EVER buy anything again from MAXNC. Their support sucks. For lack of a better term.
Anyways. I have replaced my OL driver with a zylotex board. Had some issues due to MAXNC`s canny ability to cut corners on the design and construction of their machines. I wont go into it here.
But I did manage to get my maxnc15 OL mill to go from 15 ipm MAX rapids to close to 50 IPM. I cut wax for jewlery.
I replaced the driver board with the xylotex, replaced the under sized steppers with the 269 oz`s from xylotex as well. Even got me the new power supply. under $400 for the setup and maxnc wanted $475 for just the control box.
I also made thrust plates and flex couplings for my machine. Did away with MAXNC`s wonderfull solid state collar couplings. I really dont think a stepper motor should be used as a thrust bearing. Could be just me though
The xylotex controller was pretty easy to setup and the support is wonderfull! Did have an issue with resonence that took forever to finally work out.
Here is a line to my small write up and some pics ect.
Good luck dealing with Art and his "WONDERFULL" team! I think its the heat in arizona hahahah Just kidding.
http://www.cnczone.com/forums/showthread.php?t=30988Also... the maxnc yahoo group
http://groups.yahoo.com/group/MaxNC-users/